test.cc

#include <vector>
#include <iostream>

using namespace std;

int copied = 0;
int moved = 0;

struct Foo {
  Foo() = default;
  Foo(const Foo& o) {
    copied++;
  }

  Foo(Foo&& o) MAYBE_NOEXCEPT {
    moved++;
  }
};

int main( int argc, char *argv[]) {
   vector<Foo> v;
   for (int i = 0; i < 100; i++) {
     v.emplace_back();
   }
   cout << "copied=" << copied << endl;
   cout << "moved=" << moved << endl;
   return 0;
}